Blood component measurement device and tip for blood measurement

ABSTRACT

A blood component measurement device ( 10 ) has a puncturing unit ( 18 ) provided inside a housing ( 12 ) and having a puncture needle ( 16 ); a button unit ( 20 ) for advancing and retreating the puncture needle ( 16 ); a contact mechanism ( 68 ) coming into contact with the skin of a person to be measured; and a holder ( 14 ) for displaceably holding the puncturing unit ( 18 ). The blood component measurement device ( 10 ) also has an introduction section ( 94 ) at the substantially center of a contact member ( 70 ). After the skin is punctured by the puncture needle ( 16 ) provided at the substantially center of the mechanism ( 68 ), the introduction section ( 94 ) introduces blood to testing paper ( 100 ) when the contact member ( 70 ) of the contact mechanism ( 68 ) is displaced in a sliding manner along a guide member ( 72 ).

TECHNICAL FIELD

The present invention relates to a blood component measurement devicefor measuring a component, such as glucose, of blood. More particularly,the invention relates to a tip for blood measurement which has apuncture needle capable of being advanced and retreated in the axialdirection thereof, and to a blood component measurement device havingthe tip for blood measurement.

BACKGROUND ART

In recent years, diabetics are recommended to make daily self-control bymeasuring the variations in blood sugar level by themselves. For themeasurement of blood sugar level, a blood component measurement devicehas been put into practical use, in which a test paper impregnated witha reagent capable of coloration according to the quantity of glucose inblood is mounted, blood is supplied to the test paper to effectcoloration, and the degree of coloration is optically measured tothereby determine and display the blood sugar level. In addition, ablood component measurement device using an electrochemical sensor hasalso been put to practical use.

When a patient samples his own blood, a puncture needle capable of beingadvanced and retreated in the axial direction thereof is instantaneouslyprojected by applying a repelling force of an elastic body to thepuncture needle, whereby the patient's skin is punctured by the punctureneedle and a minute amount of blood is let bleed. Such a puncture needletip is integrally provided with a measurement member such as a testpaper and mounted to a blood component measurement device, andmeasurement is conducted by use of the device, whereby a puncturing stepand a measuring step are performed automatically and continuously.

For example, such a blood component measurement device asabove-mentioned is disclosed in Japanese Patent Laid-open No. 2004-33438or Japanese Patent Laid-open No. 2004-33439, in which a puncture memberhaving a needle capable of being advanced and retreated along the axialdirection is provided at the substantially center of a casing, and atip-formed sensor is disposed at such a position as to approach theneedle when the puncture member is displaced toward the human body side.The sensor is provided to be spaced by a predetermined distance in aradial direction of a circle, with the needle as a center of the circle,and, when the needle is let puncture the skin of the human body, theblood bleeding from the skin flows toward the sensor side, to be led tothe test paper.

In addition, another blood component measurement device is disclosed inU.S. Pat. No. 6,866,675, in which a puncture needle is passed throughthe inside of a blood sampling capillary tube, and a mouth of thecapillary tube is disposed directly above a punctured part of a skin sothat blood is sampled from the punctured part and served to measurement.

Meanwhile, according to the related art as above-mentioned, the needlefor puncturing the skin and causing blood to flow out and a bloodintroduction port for leading the blood having flowed out to themeasurement unit are spaced by a predetermined distance from each other.More specifically, the needle of the puncture member is disposed on thecenter axis of the blood component measurement device, and the bloodintroduction port is spaced by a predetermined distance from the axis.As a result, the punctured part of the skin where blood is let flow outby the needle and the blood introduction port for guiding the blood arespaced from each other, so that a large amount of blood must bleed untilthe blood comes into contact with the blood introduction section, in theprocess of guiding the blood to the measurement unit.

Besides, according to the related art as above-mentioned, theconfiguration wherein the puncture needle is disposed in a capillarytube causes difficulties in design, layout or the like of themeasurement unit for measuring a component of blood, and makes itdifficult to achieve the desired measurement by use of a measurementdevice simple in configuration.

DISCLOSURE OF INVENTION

It is a principal object to provide a blood component measurement deviceand a tip for blood measurement in which blood let flow out bypuncturing is efficiently introduced to a measurement unit, wherebycomponent measurement can be achieved while using a minute amount ofblood.

In order to attain the above object, according to the present invention,there is provided a blood component measurement device having a tip forblood measurement including a puncture needle capable of being advancedand retreated in the axial direction thereof, wherein the bloodcomponent measurement device also has: a contact section which has acavity permitting the puncture needle to pass therethrough and whichcomes into contact with a skin, and a measurement unit for measuring acomponent of blood sampled; and a blood introduction section spaced fromthe puncture needle in a direction substantially orthogonal to the axisof the puncture needle and communicating with the measurement unit, andafter the skin is punctured by the puncture needle, the bloodintroduction section is displaced in a direction substantiallyorthogonal to the axis of the puncture needle toward the axis of thepuncture needle and is displaced in the axial direction of the punctureneedle toward the skin.

According to the present invention, the contact section is brought intocontact with the skin, and the puncture needle is passed through thecavity in the contact part to puncture the skin, whereby blood is letflow out from the skin. After the puncturing is finished, the bloodintroduction section is displaced in a direction substantiallyorthogonal to the axis of the puncture needle, whereby it is displacedtoward the skin where the blood is flowing out.

Therefore, by displacing the blood introduction section so as toapproach the blood, the blood can be efficiently introduced through theblood introduction section to the measurement unit. Accordingly, thedesired measurement in the blood component measurement device can beachieved with a minuter amount of blood.

In addition, preferably, the blood component measurement device furtherhas a guide section for holding the contact section displaceably in adirection at a predetermined angle to the axis of the puncture needle,and the blood introduction section is displaced under a guiding actionof the guide section. This ensures that after the puncturing step by thepuncture needle is finished, the blood introduction section can bebrought closer to blood by displacing the blood introduction section ina direction at a predetermined angle toward the axis of the punctureneedle under the guiding action of the guide section. Therefore, theblood having flowed out can be efficiently introduced to the measurementunit through the blood introduction section.

Further, when the tip for blood measurement is provided with the contactsection, the contact part can be detachably attached to the bloodcomponent measurement device and, therefore, it can be replaced readily.

Furthermore, when the tip for blood measurement is provided with theblood introduction section, the blood introduction section can bedetachably attached to the blood component measurement device and,therefore, the measurement unit can be readily replaced aftermeasurement of a blood component is completed.

Furthermore, when the tip for blood measurement is provided with themeasurement unit, the measurement unit can be detachably attached to theblood component measurement device and, therefore, the measurement unitcan be readily replaced after measurement of a blood component iscompleted.

Besides, preferably, the blood component measurement device has astopper for restricting the displacement of the contact section, and thecondition where the displacement of the contact section is restricted bythe stopper is canceled after puncture by the puncture needle isconducted. This ensures that, at the time of puncturing a skin by thepuncture needle, the puncture needle is securely locked in the state ofbeing located at the substantially center of the contact section by thestopper. On the other hand, after the puncture by the puncture needle isfinished, the restricted condition by the stopper can be canceled tothereby realize a condition where the blood introduction section islocated at the substantially center of the contact section.

Further, preferably, the contact section is provided with a first slantsurface opposed to the guide section and inclined at a predeterminedangle, the guide section is provided with a second slant surface makingcontact with the first slant surface and being at substantially the sameangle as the first slant surface, and the contact section is displacedalong the second slant surface through the first slant surface. Thisensures that the contact section can be displaced in a direction at apredetermined angle relative to the guide section, so that in the casewhere blood is let flow out from the punctured portion in a convex shapein the manner of swelling from the skin, the contact section can bebrought closer to the blood introduction section gradually from anoblique direction. As a result, in the process of displacement of thecontact section, the blood can be prevented from making contact with thesurroundings of the blood introduction section; therefore, diffusion ofthe blood due to the contact of the blood with the surroundings of theblood introduction section can be prohibited, as contrasted to the casewhere the blood introduction section is brought closer to the blood froma horizontal direction.

Besides, preferably, the blood component measurement device has ahousing, a button unit for canceling the condition where the advancingand retreating of the puncture needle are restricted is displaceablydisposed inside said housing, and the puncture needle is pushed towardthe contact section side by operating the button unit to cancel thecondition where the displacement of the puncture needle is restricted.This ensures that the puncture needle can be displaced relative to thehousing toward the contact section side by the button unit and,therefore, the operation of puncturing by the puncture needle can beeasily carried out.

Furthermore, according to the present invention, there is provided astructure including: a puncture needle capable of being advanced andretreated in the axial direction thereof; a contact section which has acavity permitting the puncture needle to pass therethrough and whichcomes into contact with a skin, and a measurement unit for measuring acomponent of blood sampled; a blood introduction section spaced from thepuncture needle in a direction substantially orthogonal to the axis ofthe puncture needle and communicating with the measurement unit; and aguide section for holding the contact section displaceably in adirection at a predetermined angle relative to the axis of the punctureneedle.

According to the present invention, the contact section in the tip forblood measurement is brought into contact with a skin, and the punctureneedle is passed through the cavity in the contact section to puncturethe skin, whereby blood is let flow out from the skin. After thepuncturing step is finished, the blood introduction section is displacedin a direction at a predetermined angle under the guiding action of theguide section, and the blood introduction section displaced from thepuncture needle in a direction substantially orthogonal to the punctureneedle is brought closer to the axis of the contact section, whereby theblood introduction section can be put into a position close to theblood. As a result, the blood can be efficiently introduced to themeasurement unit through the blood introduction section, and themeasurement by the blood component measurement device can be performedwhile using a minuter amount of blood.

In addition, preferably, the contact section is provided with a firstslant surface opposed to the guide section and inclined at apredetermined angle, the guide section is provided with a second slantsurface making contact with the first slant surface and being atsubstantially the same angle as the first slant surface, and the contactsection is displaced along the second slant surface through the firstslant surface. This ensures that the contact section can be displaced ina direction at a predetermined angle relative to the guide section;therefore, in the case where blood is left flow out into a convex shapein the manner of swelling from the skin at the punctured portion, thecontact section can be brought closer to the blood introduction sectiongradually from an oblique direction. As a result, in the process ofdisplacement of the contact section, the blood can be prevented frommaking contact with the surroundings of the blood introduction section.Accordingly, diffusion of the blood due to contact of the blood with thesurroundings of the blood introduction section can be prohibited, ascontrasted to the case where the blood introduction section is broughtcloser to the blood from a horizontal direction.

Further, there is provided a structure including: a mounted section tobe mounted to a blood component measurement device; a contact sectionwhich has a cavity permitting the puncture needle to pass therethroughand which comes into contact with a skin; and a measurement unit formeasuring a component of blood sampled, wherein the contact section isso held as to be displaceable relative to the mounted section.

According to the present invention, there is provided a configuration inwhich the tip for blood measurement can be detachably attached to ablood component measurement device through the mounted section, and,therefore, the tip for blood measurement can be replaced easily andspeedily.

Thus, according to the present invention, the contact section is broughtinto contact with the surroundings of a punctured portion of a skin, thepunctured portion is punctured by the puncture needle disposed at thecontact section, and thereafter the blood introduction section isdisplaced in a direction substantially orthogonal to the axis of thepuncture needle and is thereby displaced toward the skin where the bloodis flowing out. This ensures that the blood introduction section can beset close to the blood let flow out by the puncture needle, the bloodlet flow out by the puncture needle can be efficiently introduced to themeasurement unit through the blood introduction section, and themeasurement by the blood component measurement device can be performedwhile using a minuter amount of blood.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of appearance of a blood componentmeasurement device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the blood componentmeasurement device of FIG. 1.

FIG. 3 is an overall longitudinal sectional view of the blood componentmeasurement device.

FIG. 4 is a longitudinal sectional view showing the condition where acontact mechanism of the blood component measurement device of FIG. 3 ispressed against the skin of a person to be measured.

FIG. 5 is a schematic configuration view showing the positionalrelationships between a contact member and a guide member, in thecontact mechanism of FIG. 4, and an introduction section and apuncturing unit.

FIG. 6 is a front view of the blood component measurement device showingthe condition where a puncture needle is located at the center of thecontact member in the contact mechanism of FIGS. 4 and 5.

FIG. 7 is a longitudinal sectional view showing the condition where abutton section in the blood component measurement device of FIG. 4 ispushed and the lock condition of the puncturing unit and a stopper iscanceled.

FIG. 8 is a longitudinal sectional view showing the condition where thepuncture needle of the puncturing unit in the blood componentmeasurement device of FIG. 7 has been displaced toward the side of theperson to be measured, to puncture the skin of the person to bemeasured.

FIG. 9 is a longitudinal sectional view showing the condition where thepuncture needle of the puncturing unit in the blood componentmeasurement device of FIG. 8 has been pushed back by a springy force ofa return spring after puncturing the skin.

FIG. 10 is a longitudinal sectional view showing the condition where thestopper in the blood component measurement device of FIG. 9 has beendisplaced to the button unit side, the contact member has been slidinglydisplaced along a guide section, and the introduction section is locatedat the substantially center of the contact member.

FIG. 11 is a schematic configuration view showing the positionalrelationships between the contact member and the guide member, in thecontact mechanism of FIG. 10, and the introduction part and thepuncturing unit.

FIG. 12 is a front view of the blood component measurement deviceshowing the condition where an introduction port of the introductionsection is located at the center of the contact member in the contactmechanism of FIGS. 10 and 11.

FIG. 13 is an exploded perspective view showing a tip for bloodmeasurement according to a modified embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

In FIG. 1, reference symbol 10 denotes a blood component measurementdevice according to an embodiment of the present invention.Incidentally, the blood component measurement device 10 according tothis embodiment is for measuring a component, such as glucose, of bloodor the amount of the component (hereinafter referred to as blood sugarlevel).

As shown in FIGS. 1 to 3, the blood component measurement device 10 hasa cylindrically formed housing 12, a holder 14 displaceably providedinside the housing 12, a tip for blood measurement 17 held by the holder14 and including a puncture needle 16, a puncturing unit 18 foradvancing and retreating the puncture needle 16 in the axial directionof the latter, and a button unit 20 (see FIGS. 2 and 3) for changeoverbetween advancing and retreating of the puncture needle 16.

The housing 12 is formed in a bottomed shape opened on one end side andclosed on the other end side, and a button hole 22 is formed in asubstantially central part of the other end. A button section 24 isinserted in the button hole 22 when the button unit 20 is disposedinside the housing 12.

In addition, on one end side of the housing 12, a pair of slots 26 whicheach have a predetermined length along the axial direction and which areopposed to each other are formed in an outer peripheral surface of thehousing 12.

Further, the inner peripheral surface of the housing 12 is formed to beenlarged radially outwards on one end side as compared with the otherend side, and a step 28 is formed at the boundary between the innerperipheral surface on one end side and the inner peripheral surface onthe other end side which surfaces are different in inside diameter.

The holder 14 has a main body section 30 having a predetermined lengthalong the axial direction, and a hollow cylindrical section 32 formed onone end side of the main body section 30 and formed in correspondencewith the inner peripheral shape of the housing 12. The holder 14 isinserted into the inside of the housing 12 from the main body section 30side, and a puncturing unit 18 is disposed in the inside of the holder14.

The main body section 30 has a pair of guide grooves 34 adjacent to bothside surfaces along the axial direction, and a projected part 36projected from an upper surface of the main body section 30 whichsurface is present between the guide grooves 34. Incidentally, each ofthe guide grooves 34 has its upper surface formed in a substantiallyflat surface shape.

In addition, the main body section 30 is provided with a first mounthole 38 opened in a substantially U-shaped sectional shape toward thelower side, i.e., in the direction of arrow Y1. The first mount hole 38includes a first engagement wall 40 projected downwards (in thedirection of arrow Y1) from an inner peripheral surface of the firstmount hole 38, and a second engagement wall 42 formed on the hollowcylindrical section 32 side (the direction of arrow X1) relative to thefirst engagement wall 40 (see FIG. 3). The first and second engagementwalls 40 and 42 are provided with groove parts 44 at substantially thecenters thereof. In the groove parts 44 opened toward the lower side (inthe direction of arrow Y1), a part of the puncturing unit 18 is insertedin the manner of being displaceable along the axial direction.

The first mount hole 38 is provided with a first step part 46 where theinner wall surface on the hollow cylindrical section 32 side (thedirection of arrow X1) relative to the second engagement wall 42 isbulged toward the lower side, i.e., toward the puncturing unit 18 side(in the direction of arrow Y1). In addition, the first mount hole 38 isprovided with a second step part 48 on the hollow cylindrical section 32side (the direction of arrow X1) relative to the first step part 46. Thesecond step part 48 is opposed to the first step part 46, with thepuncturing unit 18 therebetween, and is bulged toward the puncturingunit 18 side (in the direction of arrow Y2). Incidentally, the secondstep part 48 is provided at a position on the lower side (the directionof arrow Y1) in relation to the puncturing unit 18.

The outer peripheral surface of the hollow cylindrical section 32 isprovided with an annular flange part 50 projected radially outwards, andthe peripheral surface of the flange part 50 makes contact with theinner peripheral surface of the housing 12 when the holder 14 isinserted in the inside of the housing 12. In other words, the flangepart 50 functions as a guide when the holder 14 is displaced along theinside of the housing 12.

A coil spring 52 is interposed between the flange part 50 and the steppart 28 of the housing 12, and a springy force of the coil spring 52biases in the manner of pushing the holder 14 toward the opened one endside of the housing 12 (in the direction of arrow X1) through the hollowcylindrical section 32.

In addition, the flange part 50 of the hollow cylindrical section 32 ispartly cut out, and a pair of guide pins 54 are mounted in the cut-outportions. The guide pins 54 are provided at such positions as to besubstantially symmetric with each other, with the axis of the hollowcylindrical section 32 as a center, and are mounted so as to project bya predetermined length in relation to the outer peripheral surface ofthe hollow cylindrical section 32. When the holder 14 is inserted in theinside of the housing 12, the guide pins 54 are engaged respectivelywith the slots 26 in the housing 12, and the holder 14 is so held as tobe displaceable along the axial direction in relation to the housing 12.In this case, the amount of displacement of the holder 14 issubstantially equal to the length of the slots 26 along the axialdirection.

Further, the hollow cylindrical section 32 is cut out at portionslocated on the extensions of the guide grooves 34 in the main bodysection 30, whereby a pair of cutouts 56 substantially flush with theguide grooves 34 are formed. The cutouts 56 penetrate the inside of thehollow cylindrical section 32 in the axial direction.

The hollow cylindrical section 32 is provided with a recess 58 recessedto the flange part 50 side from an end face on the main body section 30side, at a position between the pair of cutouts 56. The recess 58extends from the outer peripheral surface of the hollow cylindricalsection 32 in a direction substantially orthogonal to the axis of thehollow cylindrical part 32, and a stopper hook 60 is mounted to thehollow cylindrical section 32 through the recess 58.

The stopper hook 60 is formed in a substantially T shape from a flexiblemetallic material. One end part of the stopper hook 60 is fixed to therecess 58 through a fixing screw 62, and the other end side of thestopper hook 60 extends by a predetermined length in substantiallyorthogonal directions, with the one end part as a center.

The other end part of the stopper hook 60 is extended to such apositions as to be opposed to the pair of guide grooves 34, and hookparts 64 are projected therefrom toward the guide groove 34 sides (inthe direction of arrow Y1). The hook parts 64 are engaged with an endface of a stopper 138 (described later) disposed inside the housing 12to restrict the displacement of the stopper 138 toward the button unit20 side (in the direction of arrow X2) (see FIG. 5).

More specifically, the stopper hook 60 is so provided that its other endside can be tilted in such a direction as to be spaced away from theholder 14, with its one end part fixed by the fixing screw 62 as afulcrum.

On the other hand, the hollow cylindrical section 32 is provided in asubstantially central part thereof with a second mount hole 66 opened ina substantially rectangular shape, and the second mount hole 66communicates with the first mount hole 38 formed in the main bodysection 30. The second mount hole 66 is larger than the first mount hole38 in sectional shape, and the tip for blood measurement 17 includingthe contact mechanism 68 capable of making contact with the skin of aperson to be measured is disposed inside the second mount hole 66.

The tip for blood measurement 17 includes a puncture needle 16, a hub104 for holding the puncture needle 16, the contact mechanism 68 whichholds the hub 104 displaceably along the axial direction and which canmake contact with the skin of the person to be measured, and a testpaper (measurement unit) 100 provided in the contact mechanism 68 andmounted in a circular recess 98 into which blood is introduced.Incidentally, the puncture needle 16 is preliminarily sterilized, andthe sterilized state is maintained until use.

The hub 104 is formed in a cylindrical shape. The puncture needle 16 ismounted to one end side of the hub 104, and a reduced diameter section105 formed on the other end side is inserted into a hub gripping section112 (described later) of the puncturing unit 18. This results in thatthe hub 104 is so held as to be detachably attached to the puncturingunit 18.

The contact mechanism 68 includes a contact member (contact section) 70coming into contact with the surroundings of a punctured portion of theskin of a person to be measured, and a guide member (guide section) 72for holding the contact member 70 so that the contact member 70 isdisplaceable in an oblique direction (the direction of arrow A, in FIG.11) inclined at a predetermined angle relative to the axis of the holder14. The guide member 72 is mounted in the second mount hole 66 in theholder 14.

The contact member 70 has a center hole (cavity) 74 through which a partof the puncturing unit 18 is passed, a depression 76 formed on one endside thereof and depressed in an arcuate shape corresponding to theshape of a fingertip 148 of the person to be measured (see FIG. 4), anda pair of slant parts 78 formed on the other end side and inclined at apredetermined angle (for example, 45°) relative to the axis of thecontact member 70. Incidentally, the contact member 70 is formed in atapered shape such that the diameter is gradually reduced from an endface, which comes into contact with the person to be measured, towardthe center hole 74. Therefore, when the fingertip 148 is brought intocontact with the contact member 70, any surface of the contact member 70can be pressed appropriately, whereby outflow of blood upon puncturingcan be accelerated.

The center hole 74 is formed at a substantially central part of thecontact member 70, and is formed with such a diameter that thepuncturing unit 18 and the introduction port 80 (described later)provided in the guide member 72 can be passed therethrough when thecontact mechanism 68 is mounted to the holder 14.

The depression 76 is depressed in a concave shape so as to havesubstantially the same sectional shape along directions (directions ofarrows Y1 and Y2) substantially orthogonal to the axis of the contactmember 70. This ensures that when the person to be measured put hisfingertip 148 into contact with the contact member 70, the fingertip 148can be appropriately put into close contact with the contact member 70.

The pair of slant parts 78 are formed in such a direction (the directionof arrow X2) as to be spaced away from the depression 76, and are spacedfrom each other by a predetermined interval, with the center hole 74 asa center. The upper surfaces of the slant parts 78 are formed in asubstantially flat surface shape substantially parallel to the axis ofthe contact member 70, and first slant surfaces 82 are formed which areinclined at a predetermined angle (for example, 45°) from end parts ofthe slant parts 78 toward the lower part side of the depression 76 (inthe direction of arrow Y2). Incidentally, the pair of slant parts 78 areso disposed as to be substantially symmetric with each other, with thecenter hole 74 as a center.

In addition, pins (not shown) are mounted to mutually opposed sidesurfaces of the slant parts 78, and the pins are projected relative tothe side surfaces and disposed at such positions as to be opposed toeach other.

The guide member 72 includes a block part 84 formed in a substantiallyrectangular parallelepiped shape and fixed to the second mount hole 66in the holder 14, a pair of guide parts 86 formed on both sides of theblock part 84, and a holding hole 88 formed in a substantially centralpart of the block part 84 so as to hold a part of the puncturing unit18. The guide parts 86 are provided with second slant surfaces 90inclined at a predetermined angle relative to the axis of the guidemember 72, and the inclination angle of the pair of second slantsurfaces 90 is set to correspond to the inclination angle of the slantsurfaces of the contact member 70. The guide parts 86 are so shaped asto be substantially symmetric, with the holding hole 88 as a center.

The block part 84 is provided with a mounted part 91 projected in ahollow cylindrical shape toward the puncturing unit 18 side (in thedirection of arrow X2), and the mounted part 91 is held by beinginserted into the first mount hole 38 in the holder 14.

In addition, the block part 84 is provided with guide holes 92 in sidesurfaces located on the guide part 86 sides, and the guide holes 92 areso inclined as to be substantially parallel to the inclination angle ofthe second slant surfaces 90. The block part 84 is disposed between thepair of slant parts 78 of the contact member 70, and the second slantsurfaces 90 are put into contact with the first slant surfaces 82 of thecontact member 70. The pins (not shown) of the contact member 70 areinserted in the guide holes 92, and the contact member 70 and the guidemember 72 are engaged with each other through the guide parts 86 and theslant parts 78. This ensures that the contact member 70 can be displacedalong the second slant surfaces 90 of the guide member 72 through theslant parts 78.

Specifically, the contact member 70 is slidingly displaceable in adirection (the direction of arrow A) inclined at a predetermined anglerelative to the axis of the contact member 70. In this case, since thepins of the contact member 70 are inserted in the guide holes 92, theamount of displacement of the contact member 70 is restricted.

In addition, the block part 84 is provided with an introduction part(blood introduction part) 94 for introducing the blood flowing out froma person to be measured. The introduction part 94 has an introductionport 80 opened toward the exterior of the block part 84, a passage 96which is connected to the introduction port and through which blood iscirculated, and a circular recess 98 which communicates with the passage96 and which is depressed by a predetermined depth from the uppersurface of the block part 84.

The introduction port 80 is projected by a predetermined length from anend face of the block part 84, and is disposed to be slightly spacedfrom the holding hole 88 in a direction substantially orthogonal to theaxis of the holding hole 88 (see FIGS. 5 and 6).

The test paper 100 impregnated with a predetermined reagent is fixed inthe circular recess 98. Examples of the material of the test paper 100include polyether sulfone. Examples of the reagent include color formerssuch as glucose oxidase (GOD), peroxidase (POD), 4-aminoantipyrin, andN-ethyl N-(2-hydroxy-3-sulfopropyl). Besides, an electrochemical sensorcan also be used as the measurement unit.

The blood introduced through the introduction port 80 is supplied to thetest paper 100 impregnated with a predetermined reagent aftercirculating the circular recess 98 via the passage 96.

On the other hand, an optical measurement unit 101 including a lightemitting device (for example, LED—Light Emitting Diode) and aphotometric device (for example, PD—Photo Detector) is provided at sucha position as to front on the second mount hole 66 and be opposed to thetest paper 100, in the holder 14. An optical variation read through theoptical measurement unit 101 is arithmetically operated by a controlunit (not shown), and the result is displayed as a measurement resultthrough a display unit.

The puncturing unit 18 includes a body section 102 formed to be longalong the axial direction, a hub gripping section 112 which is formed atone end part of the body section 102 and which detachably holds the hub104 of the tip for blood measurement 17, a return spring 108 which isinterposed between the body section 102 and the first engagement wall 40of the holder 14 and which biases the body section 102 toward the buttonunit 20 side (in the direction of arrow X2), and a puncturing spring 110biasing the body section 102 in a direction (the direction of arrow X1)for spacing away from the button unit 20.

At one end part of the body section 102, the hub gripping section 112having a plurality of slits 113 is formed to be expandable in the radialdirection, and the reduced diameter section 105 of the hub 104 havingthe puncture needle 16 is held by being inserted in the hub grippingsection 112. The hub gripping section 112 is displaceably held insidethe mounted part 91 of the contact mechanism 68.

In addition, on one end side of the body section 102, a springy section114 tiltable in a radial direction with a joint portion as a fulcrum isprovided at the outer peripheral surface of the body section 102. Thespringy section 114 is normally biasing in a radial direction so as tospace away from the outer peripheral surface. When the springy section114 is depressed in a radial direction, it is tiltingly displaced towardthe body section 102 side (in the direction of arrow Y2, in FIG. 3).

The springy section 114 is provided on its outer peripheral surface witha first projection 116 a projecting in a radial direction, and thespringy section 114 is depressed in a radial direction through the firstprojection 116 a. The first projection 116 a is disposed to be alignedwith a projection 118 of the button unit 20 on substantially the samestraight line along the axial direction.

Besides, the springy section 114 is provided at its tip part with asecond projection 116 b spaced from the first projection 116 a by apredetermined interval, and the second projection 116 b projects in aradial direction, like the first projection 116 a. With the secondprojection 116 b engaged with the second step part 48 of the holder 14,displacement of the puncturing unit 18 toward the hollow cylindricalsection 32 side (in the direction of arrow X1) is restricted.

On the other hand, a first enlarged diameter part 120 enlarged in theradial direction is formed at the other end part of the body section102, and a second enlarged diameter part 122 is formed at thesubstantially center along the axial direction of the body section 102.When the puncturing unit 18 is disposed inside the holder 14, the firstenlarged diameter part 120 is disposed on the opposite side (thedirection of arrow X2) of the hollow cylindrical section 32 with respectto the first engagement wall 40, and the second enlarged diameter part122 is disposed on the hollow cylindrical section 32 side (the directionof arrow X1) relative to the second engagement wall 42.

The return spring 108 is interposed between the first enlarged diameterpart 120 and the first engagement wall 40, to bias the puncturing unit18 in a direction (the direction of arrow X2) for spacing away from thehollow cylindrical section 32 through the first engagement wall 40. Inaddition, the puncturing spring 110 is interposed between the secondenlarged diameter part 122 and the second engagement wall 42, to biasthe puncturing unit 18 toward the hollow cylindrical section 32 side (inthe direction of arrow X1) through the second engagement wall 42.

A lock part 124 projecting in a radial direction is formed between thefirst enlarged diameter part 120 and the second enlarged diameter part122, and an end face on the second enlarged diameter part 122 side (thedirection of arrow X1) of the lock part 124 is formed in a substantiallyflat surface shape. More specifically, when the body section 102 isdisplaced toward the hollow cylindrical section 32 side (in thedirection of arrow X1), the lock part 124 abuts on the second engagementwall 42, whereby displacement of the body section 102 along the axialdirection is restricted (see FIG. 8).

The button unit 20 has a tubular section 126 formed in a hollowcylindrical shape, and a cylindrical button section 24 projecting froman end face of the tubular section 126. The button unit 20 is insertedto the other end side of the housing 12, and the button section 24 isinserted into the button hole 22 in the housing 12 so that it can beexposed to the exterior.

The tubular section 126 is provided therein with an insertion hole 128in which the holder 14 and the puncturing unit 18 are inserted. Theinsertion hole 128 is provided, on its opened end side, with theprojection 118 opposed to the springy section 114 of the puncturing unit18. The projection 118 projects slightly from the inner wall surface ofthe insertion hole 128, and the opened end side of the insertion hole128 is gradually inclined in a direction toward the button section 24side (in the direction of arrow X2).

When the puncturing unit 18 is displaced along the insertion hole 128toward the hollow cylindrical section 32 side (in the direction of arrowX1) and the projection 118 abuts on the first projection 116 a of thespringy section 114, the springy section 114 is depressed in a radialdirection through the first projection 116 a, whereby the outsidediameter of the springy section 114 is reduced. As a result, the secondprojection 116 b of the springy section 114 is separated away from thesecond step part 48, the puncturing unit 18 is unlocked, and thepuncturing unit 18 becomes displaceable in a direction (the direction ofarrow X1) for spacing away from the button unit 20.

In addition, the hollow cylindrical section 126 is provided in its outerperipheral surface with a window 132 opened by cutting out asubstantially rectangular portion, whereby the inside and the outside ofthe hollow cylindrical section 126 are let communicate with each other.A spring pin 134 is mounted in the vicinity of the window 132, and, whenthe holder 14 is inserted in the button unit 20, a button spring 136 isinterposed between the spring pin 134 and the projection 36 of theholder 14. In this case, the spring pin 134 is so disposed as to belocated on the hollow cylindrical section 32 side (the direction ofarrow X1) relative to the projection 36. Incidentally, the holder 14 isso inserted that its projection 36 is aligned with the spring pin 134 onsubstantially the same straight line.

The button spring 136 is included of a tension spring, and biases thespring pin 134 and the projection 36 toward each other, so that thebutton unit 20 and the holder 14 are displaced away from each other.

On the other hand, the stopper 138 is so disposed as to be locatedbetween the button unit 20 and the holder 14 when the button unit 20 isinserted in the inside of the housing 12.

The stopper 138 has an arcuate section 140 formed in a substantiallyC-shaped sectional shape, and a pair of bifurcated sections 142 areformed at both open end parts of the arcuate section 140. The main bodysection 30 of the holder 14 is inserted in the arcuate section 140, andthe stopper 138 is displaceable along the holder 14 through the arcuatesection 140.

In addition, the bifurcated sections 142 are formed to be substantiallyparallel to the axis of the arcuate section 140, and extend toward thehollow cylindrical section 32 side of the holder 14 (in the direction ofarrow X1) with a substantially fixed width. Incidentally, the pair ofbifurcated sections 142 are formed to have substantially the same shape.

When the main body section 30 of the holder 14 is inserted in thearcuate section 140, the bifurcated sections 142 are engaged with theguide grooves 34 of the holder 14. More in detail, the bifurcatedsections 142 abut on the guide grooves 34, respectively.

This ensures that the stopper 138 is displaceable along the holder 14under the guiding action of the guide grooves 34 through the pair ofbifurcated sections 142. When the hook part 64 of the stopper hook 60mounted to the holder 14 is engaged with an end face of the stopper 138,displacement of the stopper 138 toward the button unit 20 side (in thedirection of arrow X2) is restricted.

In this case, the bifurcated sections 142 are inserted into the cutouts56 in the holder 14, and abut on the upper surfaces of the slant parts78 of the contact member 70 (see FIG. 5). In other words, since thebifurcated sections 142 are disposed on the upper side of the contactmember 70, upward sliding displacement of the guide member 72 along thesecond slant surfaces 90 is restricted.

In addition, a guide shaft 144 substantially parallel to the bifurcatedsections 142 is mounted to the substantially center of the arcuatesection 140, and a stopper spring 146 is interposed between the stopper138 and the hollow cylindrical section 32 of the holder 14 through theguide shaft 144. The stopper spring 146 is constantly biasing thestopper 138 in a direction (the direction of arrow X2) for spacing awayfrom the hollow cylindrical section 32.

The blood component measurement device 10 and the tip for bloodmeasurement 17 according to an embodiment of the present invention areconfigured basically as above-described, and their operations andeffects will be described below.

First, the tip for blood measurement 7 is mounted to the second mounthole 66 of the holder through the guide member 72, and is pushed intoward the puncturing unit 18 side (in the direction of arrow X2). Thisensures that the reduced diameter section 105 of the hub 104 held by theguide member 72 is inserted into the hub gripping section 112, and thehub 104 including the puncture needle 16 is held by the puncturing unit18. As a result, preparation for blood measurement by the bloodcomponent measurement device 10 is completed. In this case, the testpaper 100 is mounted in the circular recess 98 of the guide member 72,and the test paper 100 is opposed to the optical measurement unit 101disposed in the holder 14.

Incidentally, the condition where the blood component measurement device10 is not put in contact with the person to be subjected to bloodsampling and measurement, the button section 24 is contained inside thehousing 12 and the holder 14 is projected from one end of the housing 12by a springy force of the coil spring 52 interposed inside the housing12, as shown in FIG. 3, is taken as an initial condition in thefollowing description.

Next, starting from the initial condition as shown in FIG. 3, forexample, the person to be measured (not shown) grips the housing 12, andpresses the contact mechanism 68 of the blood component measurementdevice 10 against his own skin (for example, the fingertip 148). By thepressure exerted on the skin side (in the direction of arrow X1) in thepressing of the contact mechanism 68, the holder 14 is displaced towardthe housing 12 side (in the direction of arrow X2) against the springyforce of the coil spring 52, and the end face of the holder 14 and theend face of the housing 12 become substantially flush with each other(see FIG. 4).

In addition, with the holder 14 displaced toward the housing 12 side (inthe direction of arrow X2), the button section 24 of the button unit 20is projected through the button hole 22 in the housing 12 to theexterior.

In this case, as shown in FIG. 5, upper parts of the slant parts 78 ofthe contact member 70 are covered with the bifurcated sections 142 ofthe stopper 138 passed through the cutouts 56. Therefore, slidingdisplacement of the contact member 70 along the guide member 72 isrestricted, and the puncture needle 16 is held in the state of beingdisposed at the substantially center of the center hole 74 in thecontact member 70 (see FIG. 6).

Next, in the condition where the contact member 70 constituting thecontact mechanism 68 is pressed against the fingertip 148 of the personto be measured, the button section 24 is pushed toward the housing 12side (in the direction of arrow X1), whereby the button unit 20 isdisplaced toward the contact mechanism 68 side (in the direction ofarrow X1) against the springy force of the button spring 136. Then, asshown in FIG. 7, the projection 118 of the button unit 20 pushes thefirst projection 116 a of the puncturing unit 18 in a radially inwarddirection, to displace the springy section 114 toward the body section102 side (in the direction of arrow Y2).

In this case, with the button unit 20 displaced toward the contactmechanism 68 side (in the direction of arrow X1), its tubular section126 and an end face of the stopper 138 abut on each other. Therefore,the hook part of the stopper hook 60 having been engaged with the endface of the stopper 138 is upwardly pushed and tilted, to be separatedfrom the end face of the stopper 138. As a result, the locked conditionwhere displacement of the stopper 138 toward the button unit 20 side (inthe direction of arrow X2) is restricted is canceled. Incidentally, theend face of the button unit 20 abuts on the stopper 138, and a pressurein the direction of arrow X1 is exerted on the stopper 138, so that thestopper 138 would not be displaced toward the button unit 20 side.

This ensures that the second projection 116 b having been engaged withthe second step part 48 of the holder 14 is disengaged, and thepuncturing unit 18 is displaced toward the contact mechanism 68 side (inthe direction of arrow X1) by the springy force of the puncturing spring110 (see FIG. 8).

Then, the puncture needle 16 held at the tip of the puncturing unit 18is pushed out through the center hole 74 in the contact member 70 to theoutside relative to the center hole 74, to puncture the fingertip 148 ofthe person to be measured. This ensures that blood is let flow out fromthe punctured portion of the fingertip 148 which is punctured by thepuncture needle 16. In this case, as shown in FIG. 8, the puncturingunit 18 is restricted in displacement along the axial direction becauseof the abutment of the lock part 124 on the second engagement wall 42,so that the amount of projection of the puncture needle 16 from thecontact member 70 is restricted. In other words, the amount of punctureof the fingertip 148 by the puncture needle 16 is controlled to apredetermined amount.

Besides, the return spring 108 of the puncturing unit 18 is compressedin the direction of arrow X1 under the displacing action of thepuncturing unit 18. Therefore, after the fingertip 148 is punctured bythe puncturing unit 18, the puncturing unit 18 is immediately displacedin a direction (the direction of arrow X2) for spacing away from thefingertip 148 by the springy force of the return spring 108 (see FIG.9). As a result, the puncturing unit 18 is returned to a position wherethe springy forces of the puncturing spring 110 and the return spring108 balance, and is stopped there.

Next, as shown in FIG. 10, the pressed condition of the button section24 is canceled, whereby the button unit 20 is displaced in a direction(the direction of arrow X2) for spacing away from the holder 14 by thespringy force of the button spring 136, and the button section 24projects out through the button hole 22 to the exterior of the housing12. Simultaneously, the stopper hook 60 is tilted upwards, with its oneend fixed by the fixing screw 62 as a fulcrum, and, since the locking ofthe stopper 138 by the stopper hook 60 has been canceled, the stopper138 is displaced toward the button unit 20 side (in the direction ofarrow X2) by the springy force of the stopper spring 146. In otherwords, the stopper is displaced in the direction of arrow X2 as one bodywith the button unit 20 in the state of being in abutment on the endface of the button unit 20.

With the stopper 138 thus displaced, the contact member 70 having beenlocked by the bifurcated sections 142 of the stopper 138 becomesdisplaceable obliquely upwards (in the direction of arrow A). With theguide member 72 pushed toward the housing 12 side (in the direction ofarrow X2), it is slidingly displaced obliquely upwards along the guideparts 86 of the guide member 72 (see FIG. 11). Incidentally, in thiscase, the fingertip 148 of the person to be measured which is beingpressed against the contact member 70 is left as it is.

This ensures that the contact member 70 is displaced slightly verticallyupwards (in the direction of arrow Y2) relative to the holder 14 andtoward the housing 12 side (in the direction of arrow X2) under thesliding action of the contact member 70, resulting in a shift from thecondition where the puncture needle 16 of the puncturing unit 18 isinserted in the substantially center of the center hole 74 to thecondition where the introduction port 80 is located at the substantiallycenter of the center hole 74 (see FIG. 12). In other words, the amountof displacement in the vertical direction (the direction of arrow Y2 inthe contact member 70 is substantially equal to the interval between thepuncture needle 16 and the introduction port 80 along the verticaldirection (the direction of arrows Y1, Y2).

Therefore, the introduction port 80 is brought to the position opposedto the punctured portion of the fingertip 148 of the person to bemeasured, and the blood left flow out from the punctured portion isadhered to the introduction port 80 and is thereby introduced into thepassage 96. The blood is sucked up from the introduction port 80 intothe passage 96 by capillarity, to be introduced to the test paper 100mounted in the circular recess 98. Then, the blood 100 reacts with thereagent with which the test paper 100 is impregnated, and colorationaccording to the blood sugar level of the blood is obtained.

Finally, from the test paper 100 having undergone the coloration due tothe blood sampled, a change in the amount of light received which isbased on a change in color of the test paper 100 is optically read bythe optical measurement unit 101, whereby the blood sugar level of theblood is measured. Then, the used tip for blood measurement composed ofthe contact mechanism 68 and the puncture needle 16 is discarded by apredetermined method.

Thus, in this embodiment, the puncture needle 16 in the puncturing unit18 for puncturing the skin of a person to be measured and theintroduction port 80 for introducing the blood flowing out from thepunctured portion to the test paper 100 are disposed at a predeterminedinterval on a straight line, and the contact mechanism 68 coming intocontact with the skin is slidingly displaceable in an oblique directionrelative to the holder 14.

With the button section 24 depressed in the condition where the contactmechanism 68 is pressed against the person to be measured, the punctureneedle 16 is pushed out through the center hole 74 in the contact member70 toward the side of the person to be measured, and the puncture needle16 located at the substantially center of the center hole 74 is letpuncture the skin of the person to be measured. Thereafter, with thepressing of the button section 24 canceled, the unlocked contact member70 is slidingly displaced in an oblique direction in the state of beingpressed against the skin, resulting in the condition where theintroduction port 80 is located substantially at the center of thecenter hole 74.

As a result, the punctured portion of the person to be measured wherethe blood is let flow out by the puncture needle 16 can be locatedopposite to the introduction port 80 through a sliding displacementtogether with the contact member 70.

Specifically, the contact member 70 can be shifted under the displacingaction of the contact member 70 from the condition where the punctureneedle 16 is located at the substantially center of the center hole 74to the condition where the introduction port 80 is located at thesubstantially center of the center hole 74. This ensures that after theblood is let flow out by the puncture needle 16, the introduction port80 can be moved to a position opposed to the punctured portion, and theblood can be efficiently introduced from the introduction port 80 to thetest paper 100. In other words, the measurement in the blood componentmeasurement device can be performed while using a minuter amount ofblood.

Besides, for example, in the condition where the contact member 70 isslidingly displaced in the vertically upward direction (in the directionof arrow Y2) relative to the holder 14, the blood at the puncturedportion is displaced while keeping the state of being substantiallyparallel to the end face of the introduction port 80 until it comes tosuch a position as to face the introduction port 80. In this case, theblood is let flow out in a convex shape in the manner of swelling fromthe surface of the skin at the punctured portion. Therefore, the bloodmay make contact with the portion surrounding the introduction port 80,and the blood may diffuse along the surface of the skin from thepunctured portion.

On the other hand, in the blood component measurement device 10according to the present invention, the contact member 70 is slidinglydisplaced in an oblique direction (the direction of arrow A) for spacingaway from the person to be measured, relative to the holder 14 by whichthe guide member 72 is held; therefore, the blood at the puncturedportion approaches the introduction port 80 gradually from an obliquedirection. As a result, in the process of sliding displacement of thecontact member 70, the blood swelling from the skin can be preventedfrom making contact with the introduction port 80.

Further, the person to be measured can press the blood componentmeasurement device 10 against his own skin, and sliding displacement ofthe contact mechanism 68 can be effected by the pressing force.Therefore, the desired measurement can be performed easily by operatingthe blood component measurement device 10, and energy conservation canbe contrived, as compared with the case of a blood component measurementdevice driven through an electrical signal or the like.

Incidentally, while the case where the contact mechanism 68 of the bloodcomponent measurement device 10 is pressed against the fingertip 148 ofa person to be measured so as to puncture the fingertip 148 has beendescribed in the embodiment above, the present invention is not limitedto this, and the puncture needle 16 may be let puncture any portion ofthe skin of the person to be measured.

Besides, while the tip for blood measurement 17 according to thisembodiment has a configuration in which the tip for blood measurement 17has the puncture needle 16 and the test paper 100 constituting themeasurement unit, the puncture needle 16 and the test paper 100 may beprovided separately from the tip for blood measurement 17, or thecontact mechanism 68 may be provided separately from the tip for bloodmeasurement 17.

In addition, the tip for blood measurement 17 is not limited to theabove-mentioned configuration; for example, a tip for blood measurement200 configured as shown in FIG. 13 may also be used. Incidentally, thesame components as those of the tip for blood measurement 17 accordingto the above-described embodiment will be denoted by the same referencesymbols as used above, and detailed description of them will be omitted.

As shown in FIG. 13, the tip for blood measurement 200 includes apuncture needle 202, a hub 204 for holding the puncture needle 202, atip body 206 for holding the puncture needle 202 and the hub 204displaceably along the axial direction, a contact part 208 capable ofcoming into contact with the skin of a person to be measured, and a testpaper 210 to which the blood of the person to be measured is to beintroduced. Incidentally, FIG. 13 shows the tip for blood measurement200 in an exploded perspective view for easy understanding.

The hub 204 is formed in a cylindrical shape, the puncture needle 202 isprojected at one end of the hub 204, and a small diameter section 212formed on the other end side is inserted into a hub gripping section 112of a puncturing unit 18. As a result, the hub 204 is held relative tothe hub gripping section 112 of the puncturing unit 18.

A contact section 208 is included of an annular contact member 214coming into contact with a punctured portion of the skin of a person tobe measured.

The contact member 214 includes a center hole 216 which is formed at thesubstantially center of the contact member 214 and through which thepuncture needle 202 is to be passed, a depression 218 formed on one endside of the contact member 214 and depressed in an arcuate shapecorrespondingly to the shape of a fingertip of the person to bemeasured, and a pair of slant parts 220 which are formed on the otherend side of the contact member 214 and which are inclined at apredetermined angle relative to the axis of the contact member 214.

The slant parts 220 are formed on both sides of the center hole 216, andfirst slant surfaces 222 are provided which are inclined to the lowerside from end parts of the slant parts 220 toward the depression 218side.

On the other hand, a slider 224 capable of sliding along the axialdirection is provided inside the housing 12, and one-end parts of theslider 224 is enlarged in the width direction orthogonal to the axis ofthe slider 224. The enlarged width parts of the slider 224 are providedrespectively with a pair of shaft holes 2261 penetrating the parts alongthe longitudinal direction of the slider 224. The shaft holes 226 areformed to be parallel to each other, and the inner peripheral surfacesof the shaft holes 226 are each provided with a pair of projected streakparts 228 along the axial direction. The projected streak parts 228 ofeach of the inner peripheral surfaces are provided to be opposed to eachother.

Rotary shafts 230 are inserted in the shaft holes 226, and torsiongrooves 232 formed in the outer peripheral surface of the rotary shaft230 are engaged with the projected streak parts 228. The rotary shaft230 includes a shaft part 234 to be inserted in the shaft hole 226, anda large-width presser part 236 which is formed at one end of the shaftpart 234 and which is bulged in a radially outward direction relative tothe shaft part 234. The torsion groove 232 is formed in the outerperipheral surface of the shaft part 234. The presser parts 236 areprovided to be capable of abutment on the other end part of the contactmember 214 constituting the tip for blood measurement 200, and upwarddisplacement of the contact member 214 is restricted under theirabutting action on the contact member 214. Specifically, the presserparts 236 of the rotary shafts 230 function as stoppers for restrictingthe displacement of the contact member 214.

The torsion grooves 232 are each so formed as to gradually turn by about90° along the outer peripheral surface of the shaft part 234, with theaxis of the shaft part 234 as a center. More specifically, the shapes ofthe torsion grooves 232 in the pair of rotary shafts 230 are so set asto be symmetrical with each other, with the axis of the slider 224 as acenter.

When the slider 224 is displaced along the axial direction by anothermechanism (not shown), the rotary shafts 230 are rotatingly displacedinside the shaft holes 226 by about 90° under the engaging actionsbetween the projected streak parts 228 and the torsion grooves 232. Inthis case, the rotary shafts 230 are rotated in opposite directions sothat the presser parts 236 are spaced away from each other. Morespecifically, the pair of presser parts 236 are brought into asubstantially horizontal state through turning so as to approach theslots 26 in the housing 12. As a result, the condition where thedisplacement of the contact member 214 is restricted by the presserparts 236 is canceled, and the contact member 21 becomes capable ofbeing displaced upward through the force of pressing against the skin ofa person to be measured.

In the tip for blood measurement 200 configured as above, the pair ofrotary shafts 230 in engagement with the projected streak parts 228 ofthe shaft holes 226 are rotated by about 90° in opposite directionsattendantly on the displacement of the slider 224, resulting incancellation of the condition where displacement of the contact member214 is restricted by the presser parts 236. Attendant on this, thecontact member 214 is displaced obliquely upwards along the second slantsurfaces 238 of the tip body 206 by the force of pressing against theskin.

As a result, an introduction part 240 provided at an upper part of thetip body 206 is located to front on the center hole 216 in the contactmember 214, and the introduction part 240 approaches a punctured portionof the skin of the person to be measured. Therefore, the blood let flowout from the punctured portion is sucked up into an introduction passage242 by capillarity, is introduced to the test paper 210, and reacts withthe reagent with which the test paper 210 is impregnated, wherebycoloration according to the blood sugar level of the blood is obtained.

Furthermore, the blood component measurement device and the tip forblood measurement according to the present invention are not limited tothe above-described embodiment, and various configurations can naturallybe adopted within the scope of the gist of the invention.

1. A blood component measurement device comprising: a tip for bloodmeasurement comprising a puncture needle possessing an axis and linearlymovable for being advanced and retreated in an axial direction of theneedle; a contact section which has a cavity permitting said punctureneedle to pass therethrough and which comes into contact with a skin,the contact section displaceable in a direction that is neither parallelnor perpendicular to the axis of said puncture needle; a measurementunit for measuring a component of blood sampled; and a bloodintroduction section spaced from said puncture needle in a directionsubstantially orthogonal to the axis of said puncture needle andcommunicating with said measurement unit, the blood introduction sectionbeing at a position out of contact with the skin when the punctureneedle punctures the skin, and after the skin is punctured by saidpuncture needle by linear advancement of the puncture needle in theaxial direction, said blood introduction section is configured to bedisplaced from the position out of contact with the skin, in the axialdirection of said puncture needle toward the skin and also in adirection substantially orthogonal to the axis of said puncture needle.2. The blood component measurement device as set forth in claim 1,wherein said blood component measurement device further includes a guidesection holding said contact section, and said blood introductionsection is configured to be displaced under a guiding action of saidguide section.
 3. The blood component measurement device as set forth inclaim 1, wherein said contact section forms a part of said tip for bloodmeasurement.
 4. The blood component measurement device as set forth inclaim 1, wherein said blood introduction section forms a part of saidtip for blood measurement.
 5. The blood component measurement device asset forth in claim 1, wherein said measurement unit forms a part of saidtip for blood measurement.
 6. The blood component measurement device asset forth in claim 1, wherein said blood component measurement deviceincludes a stopper which contacts the contact section for restrictingdisplacement of said contact section, the stopper configured to move outof contact with the contact section after puncture of the skin by thepuncture needle to permit the displacement of the contact section. 7.The blood component measurement device as set forth in claim 2, whereinsaid contact section is provided with a first slant surface opposed tosaid guide section and inclined at a predetermined angle, said guidesection is provided with a second slant surface making contact with saidfirst slant surface, the first slant surface and the second slantsurface are oriented at substantially the same angle, and said contactsection is configured to be displaced relative to said guide section asa result of said first slant surface sliding along said second slantsurface.
 8. The blood component measurement device as set forth in claim1, wherein said blood component measurement device includes a housing, abutton unit displaceably disposed inside said housing and operable tocancel a condition where the advancing and retreating of said punctureneedle are restricted, and said button unit is exposed from said housingwhen said contact section is pressed against the skin.
 9. The bloodcomponent measurement device as set forth in claim 1, wherein the bloodintroduction section is part of a guide section, and the guide sectionincludes a sliding surface which is obliquely oriented relative to theaxis of the needle, and wherein the blood introduction section isdisplaceable by sliding movement along the sliding surface.
 10. A methodfor obtaining a blood sample comprising: pressing a body part against acontact section which possesses a through hole; linearly moving a needlepossessing an axis in the axial direction of the needle through thethrough hole in the contact section to puncture skin of the body part ata puncture site with a tip end of the needle to result in a bloodsample, the tip end of the needle being located in a first region of thethrough hole during puncture of the skin, the needle passing through aguide block during puncture of the skin, the guide block being movablerelative to the contact section, the guide block including a bloodintroduction port connected to a passage, the blood introduction portbeing orthogonally spaced from the axis of the tip end of the needle andoutside the first region; relatively moving the guide block and thecontact section after the puncture of the skin to cause the tip end ofthe needle to move away from said first region of the through hole ofthe contact section and to move the introduction port into the firstregion of the through hole of the contact section so that theintroduction port is positioned adjacent the puncture site, whereinrelatively moving the guide block and the contact section includesdisplacing the contact section in a direction that is neither parallelnor perpendicular to the axis of said puncture needle; the blood sampleat the puncture site being introduced into the introduction port andsupplied to a test paper containing a reagent; and measuring a componentin the blood sample supplied to the test paper.
 11. The method accordingto claim 10, wherein the first region of the through hole of the contactsection is a center of the through hole of the contact section.
 12. Themethod according to claim 10, wherein the relatively moving of the guideblock and the contact section comprises the guide block and the contactsection sliding relative to one another in a direction oblique to theaxis of the tip end of the needle.